New Heat Transfer Correlation for an HCCI Engine Derived from Measurements of Instantaneous Surface Heat Flux

Chang, Junseok; Güralp, Orgun; Filipi, Zoran; Assanis, Dennis N.; Kuo, Tang-Wei; Najt, Paul; Rask, Rod

doi:10.4271/2004-01-2996

Cited by 402 publications

(264 citation statements)

References 37 publications

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“…This kind of comparison of the numerical results with the measured values is not straightforward, since the measured values are based only on the local heat fluxes at three locations. Nevertheless, this procedure can provide an estimation of the error introduced when such strategies are followed [43].…”

Section: Investigation Of Heat Transfermentioning

confidence: 99%

A combined experimental and numerical study of thermal processes, performance and nitric oxide emissions in a hydrogen-fueled spark-ignition engine

Rakopoulos

Kosmadakis

Demuynck

et al. 2011

International Journal of Hydrogen Energy

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A COMBINED EXPERIMENTAL AND NUMERICAL STUDY OF THERMAL PROCESSES, PERFORMANCE AND NITRIC OXIDE EMISSIONS IN A HYDROGEN-FUELED SPARK-IGNITION ENGINE ABSTRACTThis work concerns the study of a spark-ignition engine fueled with hydrogen, using both measured and numerical data at various conditions, focusing on the combustion efficiency, the heat transfer phenomena and heat loss to the cylinder walls, the performance, as well as the nitric oxide (NO) emissions formed, when the fuel/air and compression ratio are varied. For the investigation of the heat transfer mechanism, the local wall temperatures and heat flux rates were measured at three locations of the cylinder liner in a CFR engine. These fluxes can provide a reliable estimation of the total heat loss through the cylinder walls and of the hydrogen flame arrival at specific locations. Together with the experimental analysis, the numerical results obtained from a validated in-house CFD code were utilized for gaining a more complete view of the heat transfer mechanism and the hydrogen combustion efficiency for the various cases examined. The performance of the CFR engine is then identified, since the calculated cylinder pressures are compared with the measured ones, from which performance and heat release rates are calculated and discussed. Further, NO emission studies have been accomplished, with the calculated results not only being compared with the measured exhaust NO ones, but also further processed for conducting an in-depth investigation of the dependence of NO production on the spatial distribution of in-cylinder gas temperature. It is revealed that for lower fuel/air ratio the burned gas temperature is held at low level and the heat loss ratio is quite low. As the load increases and stoichiometric mixtures are used, the wall and in-cylinder gas temperatures increase substantially, together with the heat loss and the NO emissions, owing to the high hydrogen combustion velocity and the consequent high rate of temperature rise. The combustion efficiency is slightly increased, but the indicated efficiency is decreased due to higher heat loss.Keywords: hydrogen; spark-ignition engine; combustion efficiency; heat transfer; NO emissions.

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Section: Investigation Of Heat Transfermentioning

confidence: 99%

A combined experimental and numerical study of thermal processes, performance and nitric oxide emissions in a hydrogen-fueled spark-ignition engine

Rakopoulos

Kosmadakis

Demuynck

et al. 2011

International Journal of Hydrogen Energy

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“…The wall temperature T wall is estimated by measuring the heat loss to the cooling water. A for HCCI application adjusted heat transfer coefficient is used, proposed by [19], calibrating the scaling factor, α scaling :…”

Section: Experimental Set-up Of the Egr Installationmentioning

confidence: 99%

An experimental and numerical investigation on the influence of external gas recirculation on the HCCI autoignition process in an engine: Thermal, diluting, and chemical effects

Machrafi

Cavadias

Guibert

2008

Combustion and Flame

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In order to contribute to the solution of controlling the auto-ignition in a Homogeneous Charge Compression Ignition (HCCI) engine, parameters linked to External Gas Recirculation (EGR) seem to be of particular interest. Experiments performed with EGR present some difficulties in interpreting results using only the diluting and thermal aspect of EGR. Lately, the chemical aspect of EGR is taken more into consideration, because this aspect causes a complex interaction with the dilution and thermal aspects of EGR. This paper studies the influence of EGR on the auto-ignition process and particularly the chemical aspect of EGR.The diluents present in EGR are simulated by N 2 and CO 2 , with dilution factors going from 0 to 46 vol%. For the chemically active species that could be present in EGR, the species CO, The fuels used for the auto-ignition are n-heptane and PRF40. It appeared that CO, in the investigated domain, did not influence the ignition delays, while NO had two different effects.At concentrations up until 45 ppm, NO advanced the ignition delays for the PRF40 and at higher concentrations, the ignition delayed. The influence of NO on the auto-ignition of nheptane seemed to be insignificant, probably due to the higher burn rate of n-heptane. CH 2 O seemed to delay the ignition. The results suggested that especially the formation of OH radicals or their consumption by the chemical additives determine how the reactivity of the auto-ignition changed.

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“…hydrogen [12,13], nor for new combustion types e.g. HCCI (homogeneous charge compression ignition) 60 [14][15][16]. This is illustrated with Fig.…”

mentioning

confidence: 92%

Heat transfer in premixed spark ignition engines part I: Identification of the factors influencing heat transfer

Broekaert

Demuynck

Cuyper

et al. 2016

Energy

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The heat transfer from the combustion gases to the cylinder walls inside a spark ignition engine is a key factor in an engine's design, due to its influence on the engine's efficiency, power and emissions. Therefore a lot of research has been conducted in order to accurately model the heat transfer, for engine design and optimization purposes. These models have been found to provide inaccurate predictions for fuels which have significantly different gas properties compared to traditional fossil fuels. This indicates that the models either do not properly include gas properties, or are missing some important properties in their formulation. In order to construct a general ("fuel-independent") heat transfer model, new measurements need to be executed, with multiple fuels that have different properties. Designing such an experiment requires a thorough understanding of the factors influencing the heat transfer and their interactions. In this paper a literature review is presented of heat transfer measurements in spark ignition engines in order to investigate the effect of the engine factors on the heat transfer. Based on this review, a root cause analysis is conducted to identify the independent factors that affect heat transfer. These factors are then used to set up two experiments according to a Design of Experiments methodology that allows the investigation of the effect of different gas properties and engine settings on the heat transfer in a consistent way. The results of these measurements for motored operation are discussed in [1] and for fired operation in a companion paper [2].

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New Heat Transfer Correlation for an HCCI Engine Derived from Measurements of Instantaneous Surface Heat Flux

Cited by 402 publications

References 37 publications

A combined experimental and numerical study of thermal processes, performance and nitric oxide emissions in a hydrogen-fueled spark-ignition engine

A combined experimental and numerical study of thermal processes, performance and nitric oxide emissions in a hydrogen-fueled spark-ignition engine

An experimental and numerical investigation on the influence of external gas recirculation on the HCCI autoignition process in an engine: Thermal, diluting, and chemical effects

Heat transfer in premixed spark ignition engines part I: Identification of the factors influencing heat transfer

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